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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7374902b3eed664244a2f066b89eea916611e9f2d39e798c961799db77f6e9f' 
  AND token = 'f/Ek/FKApifPBHC85/zLYUk02rWocjqJUzIrrhvG2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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