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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92cf24ee233bf2d2b9471f36bfd3771173eab28ed4bb742628bdd9370be3b3d' 
  AND token = 'lvQ1q7DdEZ2hQqUz5nTsxNXDUdLpp3hHNeUsXqMCl5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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