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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd00f2d31caed1e16d97b2a263921a7a54e88f2ab9e353831194b6974b9d0c51' 
  AND token = 'giLl0sHC0dAw0JAd8Q1gFQ2F4HXF9tP5eb/Yi7aoprk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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