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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37ec3cbf7999ebb77165de76e3049233a0eeec77ac48c2d8a119bb27b6f7403' 
  AND token = '47u9szAeNSRwISmbRmrHLu7hCPe0cIP2KBi/vJFCD04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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