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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d44623ffb6bef61e669562b24dcbe077a833e351a2b3b24b8747ffe9b186601' 
  AND token = 'NLg7179+rsH538twhDEgYUNCX+lhxtM+zQWZr+6lbis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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