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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0665ff4317e2ee8d4aca31390d6070df7885c5a89a6c84ef8330999c6f0505d6' 
  AND token = 'pfa/1PgK72kuvjG0eVw5MmLfNr4zO155LyE0iXGQRJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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