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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295119691339f33b4a4b5eda44c9fc2d12c74fb234dd0966c4882becd93598be' 
  AND token = '2OjzL8WNOScpPqcx7WIsoWk6ZPtXLO6GpDLQUF7bD40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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