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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896ab78b13915f19c2fc383d04ea579ad6ef100820b0481b49ea17201e94409e' 
  AND token = 'sDTZshqjI3RoQZJGs1yybWF/rI1mjTU89naEH6QwoFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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