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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc7c5d6b7c8f26b5964072b470973e98d337c62cda8c54ae5f7c8df84f2388b' 
  AND token = 'grZW74+4Yo5QVx2TkWPC+7kITxsV9HgRjzGsVZMkK2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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