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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633c6c42805dd87403d7f9eabe05b8030fd4a4f401eaebfef5c5db8e7ef2b524' 
  AND token = 'bsyB+XeAf5FnZC9WfUv67U2+ofITSgoTmhxiYPiTo3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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