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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e23089a7bf3c2b85389351b3d081176981d129f639bceec8667ff6ddfb4bf8a' 
  AND token = 'xHidHk4hJUdwp2aPtwXBWfHEDZaOGRD5ntjBGPPCQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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