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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d978a12c1d6cfa4a5ed6d8f47e3548a3a39d98f6c26c1ba19f954166a9b13f' 
  AND token = 'jsjLja2BpS8m5tBFK2FUcKMmVMR6RcbfI6VHoKB3/6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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