SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a205762b64eb9f660e152ed359d3b2af12cf29675f475d91b80b57f8b019f329' 
  AND token = 'pwhyUzIGx0i9YGSrpv7LmW2q4PvXBb2d5WdVCZVRhqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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