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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf1b70191fb2e6a8c12d1362aa90f06c0a5c6b710b2b8da3bb3aa109866fcf1' 
  AND token = 'vBvoNW0Pw/1PTEz5b54llUjI8DWVvqRvKUIECIwgZZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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