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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b2f18ba19f967069c202a92f5e9fa38f8f95c53e0d44dce8a11e06aa224b66' 
  AND token = '/C5wwS0n1tr7eV1ldqPig4CrwzHkEQD5iLwnuqQyCuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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