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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d47bced12d8b0681a77a1adea6d8b4ef4bdc9373eb962e20001be9b26b3d5c8' 
  AND token = 'kBEojGRPrhq495VT4lKauMeH7lF4MjCI3K4GJQI97lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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