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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2e319e9384b929b7c823c9f2dea3331092e15a9fcfe7071179e80282828307' 
  AND token = 'mFi015j/XaTp480BcQ0lseglJ+d3k3pf5EFoyLsWF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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