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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c61261c045b71fac61e3f20bd2f17bb8a756e8cae88505941b5aae008b98be0' 
  AND token = 'nNHmFE5f5NDCx9N2THo+Omem4AV3swZsanLvG2tt2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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