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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961463179a89f4e9ba9c777dcb60b1c2f2e02f7e1b96eb28238ca88f3acae3ba' 
  AND token = '5fqhOJVkeP25GTFnJV1iEeUKa7NnTMRc9TYnB3QKH+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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