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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d5d25e0f96cb6f768dd1c399244703a789b6580f723cc67fee8cd53b24a75c' 
  AND token = 'TPyuebZE5mlzKDy4xGUs8Gl58fZGrRDu3xUCe51XPfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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