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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be6e0052ec76bf90626dca46a70ab5f6a905bee8a50f559c8e1e6a9e7d63fd7' 
  AND token = 'eTRYpwPYJQXJDreE7mK1SNvxCfT/XLVLEnxoedFbH0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}