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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e643965ab0fc08fef842885b4439b095dded577186c311bf6bb62b63082c18b' 
  AND token = 'otNq7d02/VW4k70O6CKHI5Rzg/PoQnRI9VEtEx43LNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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