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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b80aa5cb86c51a791b755c4d46fe7f47daacca9f3f9d9a2a013499b248884f' 
  AND token = '85/SNkRPy0UZbsnJY0oaIhBIKCpb1WRLK38pjTwoypE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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