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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abacd6bdaa3360c04d5f9efb124a3a3c7fba34a0fdcd35c4bf6d11f77f6ac82' 
  AND token = 'jeWqT/8Ut46qbqDEgI9vYNTLRYg/HSYD700w3Y1H9wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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