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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1284d77d4cf1c1ee611e00b094cb9956f9382cd0c04edc39f490454db7bd8a59' 
  AND token = 'cLF4rwMmkH7YiJ6rg4GStrTY+I68Q2LCBs7d+4HoXCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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