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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bdc906bb584b50aab0147a9a9f3877ce03048f00f34381655ba57f2e0dd357' 
  AND token = 'N2H3GgYdJpy1OEGQqPA6AF7bsWY7wodf0oQYCGDAufs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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