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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d669aefb3f1cf4ba8a2ba953d6f05c966489eb2091d1cfd8dda3907eb43c8e' 
  AND token = 'TN+62Ch8m0pPyi/vLV4P00ZKfvK2rcYPkIRmj7ZPzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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