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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d865671b079b1a98889741f191ae475436714da4dfa6bce4a706c44c90f9b52' 
  AND token = 'sI+whqClkxa6zlL1raUL6CG7hhkaG6quF7keQBJS8rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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