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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfe764fe07d6b5343f47a6e21489f89cb29efa16ccb7d3d6f3b13bb9e038bf8' 
  AND token = 'S1a6OZBbXAuO/tXyPCOGW4VzpXTBkdTUKLmqxXP/aGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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