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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc7ef338d8da794d902764f2abdfcf7e5708fd8bba91c4314bc4be2268419b7' 
  AND token = 'e8CIlqRLLKhae0clLpR9cFw+DXCQnytelJztWQ5iy7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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