SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fecd1752b32e77cb90df23513fd92c98fb674da8cf397a4b18f6cbabf12e43a' 
  AND token = 'lNxYgqq+mgHyjA5iHAh5oE1IjxKbKEWiVXYfwuAwXbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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