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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b7ceed5f137575d01d3d526de4dfc2372ed9d961b1a2015301c48dc4245126' 
  AND token = '1fhCRNvXAs/1Xg67SsH6gcNTr1NmlD9WV7+NfsEGbbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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