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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a37c00c72b44b5970607cae1fbca5810ba33e553e0379e04415da5319a896b4' 
  AND token = 'wM2+yRqVeNvTPMcR0hiLeAV0edvMOgfbhpdRloi+XWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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