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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388b86856cddc6d89420edbd17c61a9b0b20b95f26a4c2e24cba0e0e909d3082' 
  AND token = 'rJIsoWEaPZg2xJj5BPWwXtUiXgtbuuxgnh0q/WGBg8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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