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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c629e4e4d568df69eebad50af83587341ff058303ba794e5d4506635b9efbd2' 
  AND token = 'grdqd4DxzsKzEuy7Wpc2A94m5oYXHG36mi6/gkP/8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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