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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9b55d898c2b0b4c7beb35ec3446935ee8161f2a54749cb1cd63cc547df0aba' 
  AND token = 'H+NEDpxh8OiedI5uY+DhZBMd+wOc0kovUnXkeOdEZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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