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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9102eb5faf17970ada8f6425bdf15b4e5b0cd22eb82fa417044f63a2d706e22f' 
  AND token = 'wHR4FRvyENJGtvp3cJRiWs1FlwYjpl+6f91H/pRYzrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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