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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feec3cfed5d8a997e982fb90e48e21520aeebedff0451f399d77c280bac6dff5' 
  AND token = '+3drEaDBgaGiK3EdngdvyF0P/s1KnDt2nAg9TbRU9dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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