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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5e510fdf1c7cced781b2fb90cd88604e6bf13789bb82bd237a2c516437ea30' 
  AND token = 'h9wRnLO/ar6jY5lFsmBuHlexsD+PkY+f1ZoT2ucbC94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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