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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730bc3da6f3d92034a6aa76b43860edcb21ade61d11a9d4ed8e0f15e1a997857' 
  AND token = 'jfZ5WQSngZnnfWRYpaneBoUnVa06ybjbvvfAlKVtQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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