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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b888076d315a2e11e540974b1788a211a11564bb819db7dd378e0370898633' 
  AND token = '5VrTUX5BmTOPd2BMDvxuDbbpyK1nauZCVISW/2KpEeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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