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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69621a54a09e93433d40be37e57a3e9db4891c4080765d9cefee9395228679b7' 
  AND token = 'uv+7p9hV+fUuaVNrF0jelCz/dK5Ra37j0vAhr/4TcEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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