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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ae75e65f86cf9f1566932161d5a3feb04f3f7ea940f4137d5f70688fe744c6' 
  AND token = 'Yp+PwF9vUpT3XSCWdk64FndhwM09oc7xm9tndSzSfY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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