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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579ebb967fa4d9bb139319c702320ca761a63d6bbeebea9fd5d3d1a8f0739b8c' 
  AND token = 'pJsvWYrNlX9CfpmufA6oKYQvo0RGyEEapqAXltwpsLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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