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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd5d5bb5ca22a945bfcec1d058671fc1a5f11a4c208c0ac5e055f8b3f44f235' 
  AND token = 'JqS6BbKKr9eIENi6xeysjOKAN3H+XTJm1zufDL9DXVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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