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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c34e63c636913c70ae88f583182a4ef5a784d73d6f0672dc161431ea5e80d9e' 
  AND token = 'k8aHf/0W116pn3ZWyZ9K3b4EuoFEZ4ZwX3G520kCZYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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