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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1916fd124dc93c488886155e37c0d3450a71ec867cdd4c62e3e264b49f57ea' 
  AND token = 'f7VnstxbncRbzE0pByM6X3hgfxl6RyoKuB/0G9X+5jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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