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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88075487397ebe5c4709cafd148cb250626e80ebba09581a844a8110014f50a' 
  AND token = 'vL0WktCnPww0L/LqaNHtIRF6ZJWKUTaBFzq49Kj1M/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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