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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa38f73180fdc477d467445822c28d90835a68fcb9598c8c8b68f4c22195f8dc' 
  AND token = 'ATFI706Vsw4VMFu3yNxxoTlxbzvxJIMrbc7vpKO16y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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