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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9357b566db5f1952402e6229cfded8c8bf2ffe30b187f5fedb57982d6659030f' 
  AND token = '0XFHdX9D1o5y5R3jw03TAgKeFHfYLY4jc/GjXqFO8gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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