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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1fc6475236f556943d2914d6a12f2ca2bd6eabdb095f79a58bfb05927d553e' 
  AND token = '1t4Vl2xvLjMPp2DTlg+HqifkfQlpOiISqVtHXq7Ebn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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