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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3931ddcc39298c5426b9e2dd01b34bc7b675467cc0b95cd4373a6224997eb368' 
  AND token = 'joa9h5tcp+hPgYQ20r2YYSFLto6JQ3qzDscOdAosc0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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