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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729f7dafd6a21816f0958effbbc29dc60ac7e8c6da7251da62a1ec2a2593afa2' 
  AND token = 'Ol/wPd0TWNnB/+aEA9YV5vG3JBt+sfycF8tycn6IdWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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