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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af8cbe27673ea72d931f7d878a094267c341171f6dfad2afaba157821db0173' 
  AND token = '2S1lGc6pG+Wwwc+ejzwMy0Cai2tgBn1ykBPVmh/oFHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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