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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0855c1ae44b6ba9a04658d12d5c0041d74f90e3cd746969f4c5b63782b4f6724' 
  AND token = 'ATwAipJ2+suqGeuWuWocm7xztjEzbhZ/0F6nsM33FEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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