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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc11462f304d81b9492710ea00c055b1fbb63d1cb38eedc56201d862fcfd84c2' 
  AND token = '/UjurFfAHRrAOL/kaMAfweW4BJZ5+mpFv3J1r8jUt8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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