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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3522dc7730fcc7b92d63c1671fefce2140e68e7ee039d70b26b55850db1f494e' 
  AND token = 'CXNVZtkrxgQVF7bF48n8DxNlL7KuRANuJOprdB4p5xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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