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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02f25a12e992a0987429c9d5243d7fbd2481a9bff84b074cf6c34a43f6531f4' 
  AND token = '0SjFbN7eqvqXoFX8b9Pgk3OHEPqOGA3AIJsM0xMeL2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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