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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55104e5cbc63f016c9b16f966f71825bc8339a8d683645d6e80a24f3904437a1' 
  AND token = 'E71vPNx5JmYVQNlTZzK8KPDysIcGVTHJ7EIBvO1eeNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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