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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753cfacfd9dbbac8de0c581f9125e566941aec07fa1b10e99bc9ce7aad0252b2' 
  AND token = '5XGFsRmvni7pZQSKzkfk7+XATajv2pRmpDBXoK+6FFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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