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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3ed0b648f24fabc777a80d0635e0a7d5a8a83d799b6cd6b6bd7e01617169d6' 
  AND token = 'mKp9CvWeb0SsoAs+JPsLKk+XMX1HEEKm6v874SJCPss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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