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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62625186385f9399fce98f674e6613992b68f1775a467c01f0ebb91b4e2749b6' 
  AND token = '30XGZw0HXtXt6/2w1tdLeopb1SDIFBKywFgUWiV8Opc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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