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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4268f8e70cb2f886211315d6323c52459954c9c5522ad5e91e567b1caa81c13' 
  AND token = 'L8mNnbog51hDBqK7Y8S1ZCYU1jSNeWhO185pGJvkCx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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