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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4191cb36ce22a13a76054b87ee383279e97451687237461cdd1190a80f248e72' 
  AND token = 'PmZnNQp4BFEAtnNxu9S6LlElGl6f8TYZQVdGROONB+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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