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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11e10d3794d3fe7b91d5000229de021545fee8b7e52d26083db5a683124b78d' 
  AND token = 'XXSL6nh01ARfJ6pna4aVPjpGqWGe5+9NpN+qPdqdgxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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