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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e06112b3705cfab8fba6f4d0cafb4562794cdfe9a50b7cee2f625ab7ad66145' 
  AND token = 'LGZ2G+LdyFoH92XsuU/kRZCBAu0IAjVEO54MwC0/FmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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