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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536afe399f0a27a75baf5c85e8f0f62bf573edac70ae4e1c235a4d68d95d59f5' 
  AND token = 'UpXtDYnO2Z1QN596NlmIZHa7//S4fggdQ7qqYgTczok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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