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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f1ecdc3f227115d3c24c78c2b6a9516780cc8550454008017ce459dd338c58' 
  AND token = '3ocp/1QS7M1ZWlRj1Cwb1zNEzqN7bQQztAiiRKfJ1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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