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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9042d5059591a142985575cd539b28b0075436bf104a49509c4f10c181c4dfaf' 
  AND token = '8J/swGvdR69v8QKa4mySNxQD8nahKxTfm9dsWfOapvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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